SGI image decoder ported to the new image API.

patch by Xiaohui Sun, sunxiaohui dsp.ac cn

Originally committed as revision 8635 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -126,6 +126,8 @@ OBJS-$(CONFIG_RV10_DECODER)            += rv10.o
 OBJS-$(CONFIG_RV10_ENCODER)            += rv10.o
 OBJS-$(CONFIG_RV20_DECODER)            += rv10.o
 OBJS-$(CONFIG_RV20_ENCODER)            += rv10.o
+OBJS-$(CONFIG_SGI_DECODER)             += sgidec.o
+OBJS-$(CONFIG_SGI_ENCODER)             += sgienc.o rle.o
 OBJS-$(CONFIG_SHORTEN_DECODER)         += shorten.o
 OBJS-$(CONFIG_SMACKAUD_DECODER)        += smacker.o
 OBJS-$(CONFIG_SMACKER_DECODER)         += smacker.o

libavcodec/allcodecs.c

@@ -122,6 +122,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(RPZA, rpza);
     REGISTER_ENCDEC (RV10, rv10);
     REGISTER_ENCDEC (RV20, rv20);
+    REGISTER_ENCDEC (SGI, sgi);
     REGISTER_DECODER(SMACKER, smacker);
     REGISTER_DECODER(SMC, smc);
     REGISTER_ENCDEC (SNOW, snow);

libavcodec/avcodec.h

@@ -159,6 +159,7 @@ enum CodecID {
     CODEC_ID_DXA,
     CODEC_ID_DNXHD,
     CODEC_ID_THP,
+    CODEC_ID_SGI,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE= 0x10000,
@@ -2220,6 +2221,7 @@ extern AVCodec png_encoder;
 extern AVCodec ppm_encoder;
 extern AVCodec rv10_encoder;
 extern AVCodec rv20_encoder;
+extern AVCodec sgi_encoder;
 extern AVCodec snow_encoder;
 extern AVCodec sonic_encoder;
 extern AVCodec sonic_ls_encoder;
@@ -2322,6 +2324,7 @@ extern AVCodec rv10_decoder;
 extern AVCodec rv20_decoder;
 extern AVCodec rv30_decoder;
 extern AVCodec rv40_decoder;
+extern AVCodec sgi_decoder;
 extern AVCodec shorten_decoder;
 extern AVCodec smackaud_decoder;
 extern AVCodec smacker_decoder;

libavcodec/sgi.h

+ /*
+ * SGI image encoder
+ * Xiaohui Sun <tjnksxh@hotmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef SGI_H
+#define SGI_H
+
+/**
+ * SGI image file signature
+ */
+#define SGI_MAGIC 474
+
+#define SGI_HEADER_SIZE 512
+
+#define SGI_GRAYSCALE 1
+#define SGI_RGB 3
+#define SGI_RGBA 4
+
+#endif
+

libavcodec/sgidec.c

+/*
+ * SGI image decoder
+ * Todd Kirby <doubleshot@pacbell.net>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "sgi.h"
+
+typedef struct SgiState {
+    AVFrame picture;
+    unsigned int width;
+    unsigned int height;
+    unsigned int depth;
+    int linesize;
+} SgiState;
+
+/**
+ * Expand an RLE row into a channel.
+ * @param in_buf input buffer
+ * @param in_end end of input buffer
+ * @param out_buf Points to one line after the output buffer.
+ * @param out_end end of line in output buffer
+ * @param pixelstride pixel stride of input buffer
+ * @return size of output in bytes, -1 if buffer overflows
+ */
+static int expand_rle_row(uint8_t *in_buf, uint8_t* in_end,
+            unsigned char *out_buf, uint8_t* out_end, int pixelstride)
+{
+    unsigned char pixel, count;
+    unsigned char *orig = out_buf;
+
+    while (1) {
+        if(in_buf + 1 > in_end) return -1;
+        pixel = bytestream_get_byte(&in_buf);
+        if (!(count = (pixel & 0x7f))) {
+            return (out_buf - orig) / pixelstride;
+        }
+
+        /* Check for buffer overflow. */
+        if(out_buf + pixelstride * count >= out_end) return -1;
+
+        if (pixel & 0x80) {
+            while (count--) {
+                *out_buf = bytestream_get_byte(&in_buf);
+                out_buf += pixelstride;
+            }
+        } else {
+            pixel = bytestream_get_byte(&in_buf);
+
+            while (count--) {
+                *out_buf = pixel;
+                out_buf += pixelstride;
+            }
+        }
+    }
+}
+
+/**
+ * Read a run length encoded SGI image.
+ * @param out_buf output buffer
+ * @param in_buf input buffer
+ * @param in_end end of input buffer
+ * @param s the current image state
+ * @return 0 if no error, else return error number.
+ */
+static int read_rle_sgi(unsigned char* out_buf, uint8_t *in_buf,
+                        uint8_t *in_end, SgiState* s)
+{
+    uint8_t *dest_row;
+    unsigned int len = s->height * s->depth * 4;
+    uint8_t *start_table = in_buf;
+    unsigned int y, z;
+    unsigned int start_offset;
+
+    /* size of  RLE offset and length tables */
+    if(len * 2  > in_end - in_buf) {
+        return AVERROR_INVALIDDATA;
+    }
+
+    in_buf -= SGI_HEADER_SIZE;
+    for (z = 0; z < s->depth; z++) {
+        dest_row = out_buf;
+        for (y = 0; y < s->height; y++) {
+            dest_row -= s->linesize;
+            start_offset = bytestream_get_be32(&start_table);
+            if(start_offset > in_end - in_buf) {
+                return AVERROR_INVALIDDATA;
+            }
+            if (expand_rle_row(in_buf + start_offset, in_end, dest_row + z,
+                dest_row + FFABS(s->linesize), s->depth) != s->width)
+                return AVERROR_INVALIDDATA;
+        }
+    }
+    return 0;
+}
+
+/**
+ * Read an uncompressed SGI image.
+ * @param out_buf output buffer
+ * @param out_end end ofoutput buffer
+ * @param in_buf input buffer
+ * @param in_end end of input buffer
+ * @param s the current image state
+ * @return 0 if read success, otherwise return -1.
+ */
+static int read_uncompressed_sgi(unsigned char* out_buf, uint8_t* out_end,
+                uint8_t *in_buf, uint8_t *in_end, SgiState* s)
+{
+    int x, y, z;
+    uint8_t *ptr;
+    unsigned int offset = s->height * s->width;
+
+    /* Test buffer size. */
+    if (offset * s->depth > in_end - in_buf) {
+       return -1;
+    }
+
+    for (y = s->height - 1; y >= 0; y--) {
+        out_end = out_buf + (y * s->linesize);
+        for (x = s->width; x > 0; x--) {
+            ptr = in_buf++;
+            for(z = 0; z < s->depth; z ++) {
+                bytestream_put_byte(&out_end, *ptr);
+                ptr += offset;
+            }
+        }
+    }
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx,
+                        void *data, int *data_size,
+                        uint8_t *in_buf, int buf_size)
+{
+    SgiState *s = avctx->priv_data;
+    AVFrame *picture = data;
+    AVFrame *p = &s->picture;
+    uint8_t *in_end = in_buf + buf_size;
+    unsigned int dimension, bytes_per_channel, rle;
+    int ret = 0;
+    uint8_t *out_buf, *out_end;
+
+    if (buf_size < SGI_HEADER_SIZE){
+        av_log(avctx, AV_LOG_ERROR, "buf_size too small (%d)\n", buf_size);
+        return -1;
+    }
+
+    /* Test for SGI magic. */
+    if (bytestream_get_be16(&in_buf) != SGI_MAGIC) {
+        av_log(avctx, AV_LOG_ERROR, "bad magic number\n");
+        return -1;
+    }
+
+    rle = bytestream_get_byte(&in_buf);
+    bytes_per_channel = bytestream_get_byte(&in_buf);
+    dimension = bytestream_get_be16(&in_buf);
+    s->width  = bytestream_get_be16(&in_buf);
+    s->height = bytestream_get_be16(&in_buf);
+    s->depth  = bytestream_get_be16(&in_buf);
+
+    if (bytes_per_channel != 1) {
+        av_log(avctx, AV_LOG_ERROR, "wrong channel number\n");
+        return -1;
+    }
+
+    /* Check for supported image dimensions. */
+    if (dimension != 2 && dimension != 3) {
+        av_log(avctx, AV_LOG_ERROR, "wrong dimension number\n");
+        return -1;
+    }
+
+    if (s->depth == SGI_GRAYSCALE) {
+        avctx->pix_fmt = PIX_FMT_GRAY8;
+    } else if (s->depth == SGI_RGB) {
+        avctx->pix_fmt = PIX_FMT_RGB24;
+    } else if (s->depth == SGI_RGBA) {
+        avctx->pix_fmt = PIX_FMT_RGBA;
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "wrong picture format\n");
+        return -1;
+    }
+
+    if (avcodec_check_dimensions(avctx, s->width, s->height))
+        return -1;
+    avcodec_set_dimensions(avctx, s->width, s->height);
+
+    if (p->data[0])
+        avctx->release_buffer(avctx, p);
+
+    p->reference = 0;
+    if (avctx->get_buffer(avctx, p) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed.\n");
+        return -1;
+    }
+
+    p->pict_type = FF_I_TYPE;
+    p->key_frame = 1;
+    out_buf = p->data[0];
+
+    out_end = out_buf + p->linesize[0] * s->height;
+
+    s->linesize = p->linesize[0];
+
+    /* Skip header. */
+    in_buf += SGI_HEADER_SIZE - 12;
+    if (rle) {
+        ret = read_rle_sgi(out_end, in_buf, in_end, s);
+    } else {
+        ret = read_uncompressed_sgi(out_buf, out_end, in_buf, in_end, s);
+    }
+
+    if (ret == 0) {
+        *picture   = s->picture;
+        *data_size = sizeof(AVPicture);
+        return buf_size;
+    } else {
+        return -1;
+    }
+}
+
+static int sgi_init(AVCodecContext *avctx){
+    SgiState *s = avctx->priv_data;
+
+    avcodec_get_frame_defaults(&s->picture);
+    avctx->coded_frame = &s->picture;
+
+    return 0;
+}
+
+static int sgi_end(AVCodecContext *avctx)
+{
+    SgiState * const s = avctx->priv_data;
+
+    if (s->picture.data[0])
+        avctx->release_buffer(avctx, &s->picture);
+
+    return 0;
+}
+
+AVCodec sgi_decoder = {
+    "sgi",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_SGI,
+    sizeof(SgiState),
+    sgi_init,
+    NULL,
+    sgi_end,
+    decode_frame,
+};
+

libavcodec/sgienc.c

+/*
+ * SGI image encoder
+ * Todd Kirby <doubleshot@pacbell.net>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "sgi.h"
+#include "rle.h"
+
+#define SGI_SINGLE_CHAN 2
+#define SGI_MULTI_CHAN 3
+
+typedef struct SgiContext {
+    AVFrame picture;
+} SgiContext;
+
+static int encode_init(AVCodecContext *avctx){
+    SgiContext *s = avctx->priv_data;
+
+    avcodec_get_frame_defaults(&s->picture);
+    avctx->coded_frame = &s->picture;
+
+    return 0;
+}
+
+static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
+                        int buf_size, void *data) {
+    SgiContext *s = avctx->priv_data;
+    AVFrame * const p = &s->picture;
+    uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf;
+    int x, y, z, length, tablesize;
+    unsigned int width, height, depth, dimension;
+    unsigned char *orig_buf = buf, *end_buf = buf + buf_size;
+
+    *p = *(AVFrame*)data;
+    p->pict_type = FF_I_TYPE;
+    p->key_frame = 1;
+
+    width = avctx->width;
+    height = avctx->height;
+
+    switch (avctx->pix_fmt) {
+        case PIX_FMT_GRAY8:
+            dimension = SGI_SINGLE_CHAN;
+            depth = SGI_GRAYSCALE;
+            break;
+        case PIX_FMT_RGB24:
+            dimension = SGI_MULTI_CHAN;
+            depth = SGI_RGB;
+            break;
+        case PIX_FMT_RGBA:
+            dimension = SGI_MULTI_CHAN;
+            depth = SGI_RGBA;
+            break;
+        default:
+            return AVERROR_INVALIDDATA;
+    }
+
+    tablesize = depth * height * 4;
+    length = tablesize * 2 + SGI_HEADER_SIZE;
+
+    if (buf_size < length) {
+        av_log(avctx, AV_LOG_ERROR, "buf_size too small(need %d, got %d)\n", length, buf_size);
+        return -1;
+    }
+
+    /* Encode header. */
+    bytestream_put_be16(&buf, SGI_MAGIC);
+    bytestream_put_byte(&buf, 1); /* RLE */
+    bytestream_put_byte(&buf, 1); /* bytes_per_channel */
+    bytestream_put_be16(&buf, dimension);
+    bytestream_put_be16(&buf, width);
+    bytestream_put_be16(&buf, height);
+    bytestream_put_be16(&buf, depth);
+
+    /* The rest are constant in this implementation. */
+    bytestream_put_be32(&buf, 0L); /* pixmin */
+    bytestream_put_be32(&buf, 255L); /* pixmax */
+    bytestream_put_be32(&buf, 0L); /* dummy */
+
+    /* name */
+    memset(buf, 0, SGI_HEADER_SIZE);
+    buf += 80;
+
+     /* colormap */
+    bytestream_put_be32(&buf, 0L);
+
+    /* The rest of the 512 byte header is unused. */
+    buf += 404;
+    offsettab = buf;
+
+    /* Skip RLE offset table. */
+    buf += tablesize;
+    lengthtab = buf;
+
+    /* Skip RLE length table. */
+    buf += tablesize;
+
+    /* Make an intermediate consecutive buffer. */
+    if ((encode_buf = av_malloc(width)) == NULL)
+        return -1;
+
+    for (z = 0; z < depth; z++) {
+        in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
+
+        for (y = 0; y < height; y++) {
+            bytestream_put_be32(&offsettab, buf - orig_buf);
+
+            for (x = 0; x < width; x++)
+                encode_buf[x] = in_buf[depth * x];
+
+            if((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
+                av_free(encode_buf);
+                return -1;
+            }
+
+            buf += length;
+            bytestream_put_byte(&buf, 0);
+            bytestream_put_be32(&lengthtab, length + 1);
+            in_buf -= p->linesize[0];
+        }
+    }
+
+    av_free(encode_buf);
+    /* total length */
+    return buf - orig_buf;
+}
+
+AVCodec sgi_encoder = {
+    "sgi",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_SGI,
+    sizeof(SgiContext),
+    encode_init,
+    encode_frame,
+    NULL,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA, PIX_FMT_PAL8, PIX_FMT_GRAY8, -1},
+};
+

libavformat/img2.c

@@ -54,6 +54,7 @@ static const IdStrMap img_tags[] = {
     { CODEC_ID_GIF       , "gif"},
     { CODEC_ID_TARGA     , "tga"},
     { CODEC_ID_TIFF      , "tiff"},
+    { CODEC_ID_SGI       , "sgi"},
     {0, NULL}
 };
 

libavformat/isom.c

@@ -125,6 +125,7 @@ const AVCodecTag codec_movvideo_tags[] = {
     { CODEC_ID_VC1, MKTAG('v', 'c', '-', '1') }, /* SMPTE RP 2025 */
 
     { CODEC_ID_DNXHD, MKTAG('A', 'V', 'd', 'n') }, /* AVID DNxHD */
+    { CODEC_ID_SGI,   MKTAG('s', 'g', 'i', ' ') }, /* SGI  */
 
     { CODEC_ID_NONE, 0 },
 };